I did but it's probably not quite as binary as that in reality, that's just my simplistic view. I think the club were hoping for Matheus Franca to have an impact this season as well, in which case on paper:
Last season's attacking options: Eze (but was injured for 30% of the season), Olise (but was injured for 50% of the season), Schlupp, Ayew, Mateta, Edouard
This season's attacking options: Eze, Kamada, Sarr, Franca, Mateta, Nketiah
If you consider the number of games Olise missed last season you could reasonably look at that and think over a 38 game season we should be able to get a similar haul from the new players. Kamada has played Champions League football, has won the Europa League and done well for Glasner, whilst Nketiah has pedigree. It just turns out Kamada is hopeless, Franca got injured straight away and Nketiah has struggled to fit in to the system.